Vibration assisted welding (VAW) has emerged as a successful replacement for heat treatments and post-weld vibration treatments of arc welds to reduce residual stresses and distortions and thus to improve its mechanical properties. This review paper tries to create a knowledge platform for such a next generation research by consolidating the findings, merits, demerits and shortfalls identified hitherto in the field of VAW. This paper presents a review on the various techniques and processes of applying vibration to the welding system and their effects on microstructure, mechanical properties and residual stress of welds, and the directions for future research are presented. Vibration of workpiece during welding, oscillation of weld pool, oscillation of molten droplet, oscillation of welding arc and vibration of welding electrode were identified from the literature as the possible ways of imparting vibration. The advancement in the direction of computational work is also observed.

Vibration assisted welding processes and their influence on quality of welds

A steel wire for use in the straight polarity carbon dioxide shielded arc welding, which comprises 0.003 to 0.20 mass % of C, 0.05 to 2.5 mass % of Si, 0.25 to 3.5 mass % of Mn, 0.015 to 0.100 mass % of REM (rare earth metals), 0.001 to 0.05 mass % of P, 0.001 to 0.05 mass % of S, and the balanced amount of Fe and inevitable impurities; the steel wire which further comprises 0.0100 mass % or less of O; the steel wire which still further comprises one or more of 0.02 to 0.50 mass % of Ti, 0.02 to 0.50 mass % of Zr and 0.02 to 3.00 mass % of Al; the steel wire which still further comprises 0.0001 to 0.0150 mass % of K; the steel wire which still further comprises 3.0 mass % or less of Cr, 3.0 mass % or less of Ni, 1.5 mass % or lass of Mo, 3.0 mass % or less of Cu, 0.015 mass % or less of B, 0.20 mass % or less of Mg, 0.5 mass % or less of Nb, 0.5 mass % or less of V, 0.020 mass % or less of N; and a welding process which uses one of the above steel wires. The welding process allows the spray transfer of a molten droplet and thus allows the reduction of sputtering and also the formation of a weld bead of an excellent shape, in the carbon dioxide shielded arc welding using a shield gas containing CO2 gas as its main component.

Steel wire for carbon dioxide shielded arc welding and welding process using the same

The invention relates generally to welding and, more specifically, to welding wires for arc welding, such as Gas Metal Arc Welding (GMAW) or Flux Core Arc Welding (FCAW). In one embodiment, a tubular welding wire includes a sheath and a core. Further, the core includes a carbon source and an agglomerate having a Group I or Group II compound, silicon dioxide, and titanium dioxide. Additionally, the carbon source and the agglomerate together comprise less than 10% of the core by weight.

Systems and methods for welding electrodes

PROBLEM TO BE SOLVED: To provide a solid wire for gas shielded arc welding, the solid wire that is highly efficient and provides excellent mechanical performance in a weld zone when carbon dioxide gas shielded arc welding is applied to a carbon steel whose strength is not higher than 520 N/mm 2 class. SOLUTION: The solid wire for gas shielded arc welding has the composition containing, by mass%, 0.70-1.00% Si, 1.50-1.90% Mn, 0.005-0.025% S, 0.19-0.25% Ti, 0.12-0.35% Mo, 0.020-0.100% C, ≤0.0050% B, and ≤0.45% Cu, wherein P and O is regulated to, by mass%, ≤0.020% and ≤0.0160%, respectively, and Si/Mn is controlled to ≥0.385, total contents of Mn and Mo is controlled to ≤2.20 mass%, and total contents of S and O is controlled to ≤0.034 mass%, and wherein when C content (mass%) is [C] and B content (mass%) is [B], the following expressions are satisfied. When 0.020≤[C]≤0.05, [B]≥0.0015; when 0.050<[C]<0.060, [B]≥0.009-0.15×[C]; and when 0.080≤[C]≤0.100, [B]≤0.013-0.10×[C]. COPYRIGHT: (C)2006,JPO&NCIPI

Solid wire for gas shielded arc welding

PROBLEM TO BE SOLVED: To provide a gas shielded arc welding method by which weld metal having a superior strength and toughness is obtained, even in multi-layer welding with high heat input and high interpass temperature, and by which improved weldability is demonstrated by reducing the mount of the occurrence of spatter and of formation of slag at welding SOLUTION: Welding is performed by using: a welding steel wire composed of a steel wire stock containing by mass 001-010% C, 02-12% Si, 10-25% Mn, 005-020% Ti, 0003-0020% S, ≤0020% P, 005-05% Mo, 005-03% Cr, ≤05% Cu, 0005-002% Al, and 00005-00050% B; and gaseous mixture containing 10-50 volume % Co 2 and 50-90 volume% Ar as a shielding gas, thereafter time required until the bead of the final pass is cooled from 800°C to 500°C is adjusted to 15-450 seconds COPYRIGHT: (C)2005,JPO&NCIPI

Gas-shielded arc welding method

PROBLEM TO BE SOLVED: To provide a welding wire which can maintain a stable feeding performance even in such critical working conditions that the feeding speed of the welding wire increases or the temperature of the welding wire increases as is the case with the gas shielded arc welding under a high heat input and high interpass temperature. SOLUTION: The steel wire material of the welding wire comprises C:0.005-0.09 mass%, Si:0.50-1.2 mass%, Mn:1.50-2.2 mass%, Ti:0.15-0.30 mass%, B:0.0005-0.0035 mass%, Cu:≤0.50 mass%, S:0.005-0.025 mass% and the balance Fe with unavoidable impurities. The surface of the welding wire is covered by a solid lubricant layer of 0.2-1.0 g per the steel wire material of 10 kg, and the surface of the solid lubricant layer is coated with a lubricant of 0.2-1.8 g per the steel wire material of 10 kg. COPYRIGHT: (C)2004,JPO&NCIPI

Steel wire for gas shielded arc welding

A steel wire for MAG welding in DC-electrode negative contains about 0.20% by mass or less of C, about 0.25% to about 2.5% by mass of Si, about 0.45% to about 3.5% by mass of Mn, about 0.005% to about 0.040% by mass of rare-earth elements, about 0.05% by mass or less of P, about 0.05% by mass or less of S, and the balance being Fe and incidental impurities. A method for MAG welding in DC-electrode negative for welding steel sheets having a thickness of about 0.2 to about 4.5 mm using the steel wire is also disclosed.

Steel wire for MAG welding and MAG welding method using the same

PROBLEM TO BE SOLVED: To provide a welding method of a thick steel plate which is suitable for pipe making welding of large diameter steel pipes such as UOE steel pipe with a thickness of ≥30 mm and spiral steel pipe. SOLUTION: In welding a steel material with a thickness of ≥30 mm or more from both sides, an electrode for gas shielded arc welding is arranged, as multi-electrode welding as necessary, in the front in the welding direction of the first electrode in multi-electrode submerged arc welding for hybrid welding. In the hybrid welding, the multi-electrode submerged arc welding is performed with a heat input to satisfy an expression (1) while, desirably, the gas shielded arc welding is performed with a heat input to satisfy an expression (2). If the gas shielded arc welding is multi-electrode welding, the wire diameter to be applied for the first electrode is ≥1.4 mm, with a current density set at ≥500 A/mm 2 . Provided that 0.18t-3≤Q S ≤0.35t-5.5 (1), where t is the thickness (mm) of the steel material and Q S is a welding heat input (KJ/mm) of multi-electrode submerged arc welding, and that Q G ≤0.17t-1.5 (2), where t is the thickness (mm) of the steel material and Q G is a welding heat input (KJ/mm) of gas shielded arc welding. COPYRIGHT: (C)2011,JPO&INPIT

Welding method of thick steel plate

PROBLEM TO BE SOLVED: To provide a welding wire that exhibits stable feed performance even in the case where a feeding speed of the welding wire is increased in electroslag welding using a large electric current or where the welding wire is used under such severe conditions as the raised temperature of the welding wire. SOLUTION: As the welding wire, the steel wire contains 0.02-0.30 wt% C, 0.05-1.8 wt% Si, 0.5-3.5 wt% Mn, 0.03-2.5 wt% Mo, 3.0 wt% or less Ni, 0.007-0.40 wt% Ti, 0.0003-0.025 wt% B, 0.012 wt% or less N, and 0.0009-0.015 wt% O, with the balance Fe and inevitable impurities. Also, the steel wire possesses, on the surface, fatty acid ester or lubricant at 0.2-1.8 g per 10 kg steel wire or fatty acid ester and lubricant at 0.2-1.8 g in total per 10 kg steel wire. Further, the steel wire contains a lubricant mixture composed of 15-70 wt% MoS 2 or BN, or 15-70 wt% in total MoS 2 and BN, 2 wt% or less wax, 2-70 wt% K-compound, and 5-70 wt% copper powder, at the rate of 0.2-1.0 g per 10 kg steel wire. COPYRIGHT: (C)2004,JPO

Tokihiko Kataoka

Papers

Gas-shielded arc welding method

Steel wire for gas shielded arc welding

Steel wire for MAG welding and MAG welding method using the same

Welding method of thick steel plate

Steel wire for electroslag welding